From May 1986 to May 1992, 72 patients were diagnosed and operated for primary lung cancer, among them 65 patients were clinically evaluated at the department of Thoracic & Cardiovascular Surgery, Masan Koryo General Hospital. 1. There were 52 males 13 females[M:F=4:1], and 5th, 6th decade of life[72%] was peak incidence. 2. The preoperative diagnosis and its positive rate were sputum cytology 35%, bronchoscopy 47%, pleural effusion cytology 80%, and pleural biopsy 50%. 3. The classification histologic types were squamous cell cancer 71%, adenocarcinoma 17%, undifferentiated cell carcinoma 4.6%, and staging classification were Stage I 31%, Stage II 22%, Stage IIIa 26%, and Stage IIIb 20%. 4. The operative methods were lobectomy 52%, pneumonectomy 36%, and open biopsy 12%, and operability was 89%, resectability was 88%. 5. The postoperative complications developed 13 patients[22%], and operative mortality was 5%. 6. The overall actuarial survival rate was 1year 70%, 2year 42%, 3year 32%, 4year 26%, and 5year 22%, according to Stage 5year survival rate was Stage I 37%, Stage II 22%, Stage IIIa 3year 12%, Stage IIIb 2year 23%. And according to operative method lobectomy 23%, pneumonectomy 19%.